arnavsacheti / PeakRDL-BusDecoder / 28974259588

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fix: restore apb3/apb4 interface import paths with deprecation shims (#79)

The #66 cpuif merge kept re-export shims for the cpuif classes but
deleted cpuif/apb3/apb3_interface.py and cpuif/apb4/apb4_interface.py
outright, breaking `from peakrdl_busdecoder.cpuif.apb4.apb4_interface
import APB4SVInterface` (and the APB3/Flat counterparts) with no
migration path.

Recreate both modules as deprecation shims: importing them emits a
DeprecationWarning pointing at cpuif/apb/apb_interface, and the old
class names are thin subclasses of the merged APBSVInterface /
APBFlatInterface that pin the protocol naming the old hardwired
classes used ("apb3_intf"/"apb4_intf", "s_apb", "m_apb_"). Port-list
behavior inherits from the merged classes, so the shims stay coherent
with newer features like clk_src.

tests/unit/test_deprecated_imports.py pins all historical import paths
(interface shims warn; the silent cpuif shims from #66 keep resolving
to the merged classes) so future refactors can't drop them silently —
the suite's filterwarnings=error also guarantees nothing internal
imports the deprecated modules.


Claude-Session: https://claude.ai/code/session_01GMyMaHGbpgrU6YvFVTjKYW

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

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